Simultaneously unblocking multiple valve fittings

ABSTRACT

A method for simultaneously unblocking multiple blocked valve fittings is described. The method includes coupling a tool to unblock multiple valve fittings simultaneously to a valve with multiple valve fitting blocked to fluid flow. The tool includes a pressure vessel holding a cleaning fluid, an input conduit fluidically coupled to the pressure vessel to flow the cleaning fluid from a cleaning fluid source to the pressure vessel and to adjust a pressure of the pressure vessel, and injection conduits to flow the cleaning fluid from the pressure vessel to the valve fittings. The method includes simultaneously flowing the cleaning fluid from the pressure vessel through the injection conduits to the valve fittings. Responsive to flowing the cleaning fluid to the valve fitting, the valve fittings are unblocked.

TECHNICAL FIELD

This disclosure relates to valves to control fluid flow.

BACKGROUND OF THE DISCLOSURE

Some valves have components and clearances between components that canbecome blocked with corrosion or debris over time. Valves can containvalve fittings positioned on an external surface of the valve andlocated proximal to regions of potential blockages for unblocking theseregions of potential blockages. Multiple blockages can occur at the sametime in a valve. One or more blockages can cause a valve to fail.

SUMMARY

This disclosure describes technologies related to methods forsimultaneously unblocking multiple blocked valve fittings.Implementations of the present disclosure include a method forsimultaneously unblocking the multiple blocked valve fittings. Themethod includes coupling a tool which unblocks multiple valve fittingssimultaneously to a valve. The valve includes a first valve fitting anda second valve fitting. The first valve fitting and the second valvefitting are blocked to fluid flow through the valve. The tool includes apressure vessel to hold a cleaning fluid. The tool also includes aninput conduit fluidically coupled to the pressure vessel. The inputconduit flows the cleaning fluid from a cleaning fluid source to thepressure vessel. The input conduit flows a fluid to adjust a pressure ofthe pressure vessel. The tool includes a first injection conduit havinga first injection conduit first end mechanically coupled to the pressurevessel and a first injection conduit second end to mechanically coupleto the first valve fitting. The first injection conduit flows thecleaning fluid from the pressure vessel to the first valve fitting. Thetool includes a second injection conduit having a second injectionconduit first end mechanically coupled to the pressure vessel. The toolincludes a second injection conduit second end to mechanically couple tothe second valve fitting. The second injection conduit flows thecleaning fluid from the pressure vessel to the second valve fitting.Flowing the cleaning fluid from the cleaning fluid source can includeflowing the cleaning fluid through the input conduit into the pressurevessel. The tool is portable.

The method for simultaneously unblocking the multiple blocked valvefittings includes simultaneously flowing the cleaning fluid from thepressure vessel through the first injection conduit to the first valvefitting and through the second injection conduit to the second valvefitting. Flowing the cleaning fluid from the pressure vessel through thefirst injection conduit to the first valve fitting and through thesecond injection conduit to the second valve fitting can includepressurizing the pressure vessel.

Simultaneously flowing the cleaning fluid from the pressure vesselthrough the first injection conduit to the first valve fitting andthrough the second injection conduit to the second valve fitting caninclude opening a first injection valve positioned in the firstinjection conduit. The first injection valve controls cleaning fluidflow through the first injection conduit. Responsive to opening thefirst injection valve, the cleaning fluid flows from the pressure vesselto the first valve fitting. Simultaneously flowing the cleaning fluidfrom the pressure vessel through the first injection conduit to thefirst valve fitting and through the second injection conduit to thesecond valve fitting can include shutting the first injection valve.Responsive to shutting the first injection valve, the flow of thecleaning fluid stops from the pressure vessel to the first valvefitting. Simultaneously with opening the first injection valve, themethod can include opening a second injection valve positioned in thesecond injection conduit to control cleaning fluid flow through thesecond injection conduit. Responsive to opening the second injectionvalve, the cleaning fluid flows from the pressure vessel to the secondvalve fitting. The method includes shutting the second injection valve.Responsive to shutting the second injection valve, flow of the cleaningfluid stops from the pressure vessel to the second valve fitting.

Simultaneously flowing the cleaning fluid from the pressure vesselthrough the first injection conduit to the first valve fitting andthrough the second injection conduit to the second valve fitting caninclude a first pressure gauge fluidically coupled to the firstinjection conduit downstream from the first injection valve. Downstreamfrom the first injection valve is away from the pressure vessel. Thefirst pressure gauge monitors a first fluid pressure in the first valvefitting. A second pressure gauge is fluidically coupled to the secondinjection conduit downstream from the second injection valve. The secondpressure gauge monitors a second fluid pressure in the second valvefitting. Simultaneously flowing the cleaning fluid from the pressurevessel through the first injection conduit to the first valve fittingand through the second injection conduit to the second valve fitting caninclude, before opening the first injection valve, sensing a firstinjection conduit pressure with the first pressure gauge. The methodincludes determining that the first injection conduit pressure is lessthan the minimum injection pressure. In response to determining that thefirst injection conduit pressure is less than the minimum injectionpressure; the method includes opening the first injection valvepositioned in the first injection conduit. The method includes sensingthe first injection conduit pressure is at least the minimum injectionpressure. Responsive to sensing the first injection conduit pressure isat least the minimum injection pressure, the method includes shuttingthe first injection valve. Simultaneously before opening the secondinjection valve, the method includes sensing a second injection conduitpressure with the second pressure gauge. The method includes determiningthat the second injection conduit pressure is less than the minimuminjection pressure. In response to determining that the second injectionconduit pressure is less than the minimum injection pressure; the methodincludes opening the second injection valve positioned in the secondinjection conduit. The method includes sensing the second injectionconduit pressure is at least the minimum injection pressure. Responsiveto sensing the second injection conduit pressure is at least the minimuminjection pressure, the method includes shutting the second injectionvalve.

Pressurizing the pressure vessel, where the tool includes a manual handpump, includes coupling a manual hand pump to the input conduit.Pressurizing the pressure vessel with the manual hand pump includesopening an input pressure isolation valve positioned in input conduit.Pressurizing the pressure vessel with the manual hand pump includesoperating a manual hand pump coupled to the input conduit to raise thepressure to a minimum injection pressure. The minimum injection pressureis a minimum pressure necessary to unblock multiple valve fittingssimultaneously. Pressurizing the pressure vessel with the manual handpump includes determining a pressure vessel pressure has reached atleast the minimum injection pressure. In response to determining thatthe pressure vessel pressure has reached at least the minimum injectionpressure, pressurizing the pressure vessel with the manual hand pumpincludes shutting the input pressure isolation valve to maintain thepressure vessel pressure at the minimum injection pressure.

The method for unblocking the blocked valve fitting includes, responsiveto flowing the cleaning fluid to the valve fitting, unblocking the firstvalve fitting.

The method for unblocking the blocked valve fitting includes, responsiveto flowing the cleaning fluid to the valve fitting, unblocking thesecond valve fitting.

Where the tool includes a pressure vessel pressure gauge fluidicallycoupled to the pressure vessel, the method can include sensing, by thepressure vessel pressure gauge, pressure vessel pressure.

The method can include decoupling the tool from the valve. Decouplingthe tool from the valve can include decoupling the first injectionconduit second end from the first valve fitting and decoupling thesecond injection conduit second end from the second valve fitting.

The method can include determining the first valve fitting and thesecond valve fitting are blocked to fluid flow through the valve.Determining the first valve fitting and the second valve fitting areblocked to fluid flow through the valve includes opening the firstinjection valve. The method includes flowing the cleaning fluid throughthe first injection conduit. The method includes sensing the firstinjection conduit pressure is at least the minimum injection pressure.The method includes shutting the first injection valve. The methodincludes sensing a first injection conduit pressure rate decrease over atime period. The method includes comparing the first injection conduitpressure rate decrease to a first injection conduit pressure ratethreshold decrease. The method includes determining that the firstinjection conduit is blocked when the first injection conduit pressurerate decrease is less than the first injection conduit pressure ratethreshold decrease. The method includes opening the second injectionvalve. The method includes flowing the cleaning fluid through the secondinjection conduit. The method includes sensing the second injectionconduit pressure is at least the minimum injection pressure. The methodincludes shutting the second injection valve. The method includessensing a second injection conduit pressure rate decrease over the timeperiod. The method includes comparing the second injection conduitpressure rate decrease to a second injection conduit pressure ratethreshold decrease. The method includes determining that the secondinjection conduit is blocked when the second injection conduit pressurerate decrease is equal to or less than the second injection conduitpressure rate threshold decrease.

Further implementations of the present disclosure include a methodincluding coupling a first injection conduit to flow a cleaning fluid toa first valve fitting. The first valve fitting is blocked to fluid flowthrough the valve. The method includes coupling a second injectionconduit configured to flow the cleaning fluid to a second valve fitting.The second valve fitting is blocked to fluid flow through the valve. Themethod includes coupling the first injection conduit to a pressurevessel configured to hold the cleaning fluid. The method includescoupling the second injection conduit to the pressure vessel. The methodincludes pressurizing the pressure vessel holding the cleaning fluid.

The method includes, responsive to pressurizing the pressure vessel,simultaneously flowing the cleaning fluid from the pressure vesselthrough the first injection conduit to the first valve fitting andthrough the second injection conduit to the second valve fitting.Simultaneously flowing the cleaning fluid from the pressure vesselthrough the first injection conduit to the first valve fitting andthrough the second injection conduit to the second valve fitting caninclude a first pressure gauge fluidically coupled to the firstinjection conduit downstream from the first injection valve. Downstreamfrom the first injection valve is away from the pressure vessel. Thefirst pressure gauge monitors a first fluid pressure in the first valvefitting. A second pressure gauge is fluidically coupled to the secondinjection conduit downstream from the second injection valve. The secondpressure gauge monitors a second fluid pressure in the second valvefitting. Simultaneously flowing the cleaning fluid from the pressurevessel through the first injection conduit to the first valve fittingand through the second injection conduit to the second valve fitting caninclude, before opening the first injection valve, sensing a firstinjection conduit pressure with the first pressure gauge. The methodincludes determining that the first injection conduit pressure is lessthan the minimum injection pressure. The method includes, in response todetermining that the first injection conduit pressure is less than theminimum injection pressure, opening the first injection valve positionedin the first injection conduit. The method includes sensing the firstinjection conduit pressure is at least the minimum injection pressure.The method includes, responsive to sensing the first injection conduitpressure is at least the minimum injection pressure, shutting the firstinjection valve. The method includes, simultaneously before opening thesecond injection valve, sensing a second injection conduit pressure withthe second pressure gauge. The method includes determining that thesecond injection conduit pressure is less than the minimum injectionpressure. The method includes, in response to determining that thesecond injection conduit pressure is less than the minimum injectionpressure, opening the second injection valve positioned in the secondinjection conduit. The method includes sensing the second injectionconduit pressure is at least the minimum injection pressure. The methodincludes, responsive to sensing the second injection conduit pressure isat least the minimum injection pressure, shutting the second injectionvalve. The method can include flowing the cleaning fluid from a cleaningfluid source through an input conduit into the pressure vessel.

The method includes responsive to flowing the cleaning fluid to thevalve fitting, unblocking the first valve fitting. The method includes,responsive to flowing the cleaning fluid to the valve fitting,unblocking the second valve fitting.

The method can include opening a first injection valve positioned in thefirst injection conduit. The first injection valve controls cleaningfluid flow through the first injection conduit. The method includes,responsive to opening the first injection valve, flowing the cleaningfluid from the pressure vessel to the first valve fitting. The methodincludes shutting the first injection valve. The method includes,responsive to shutting the first injection valve, stopping flow of thecleaning fluid from the pressure vessel to the first valve fitting. Themethod includes simultaneously with opening the first injection valve,opening a second injection valve positioned in the second injectionconduit configured to control cleaning fluid flow through the secondinjection conduit. The method includes, responsive to opening the secondinjection valve, flowing the cleaning fluid from the pressure vessel tothe second valve fitting. The method includes shutting the secondinjection valve. The method includes, responsive to shutting the secondinjection valve, stopping flow of the cleaning fluid from the pressurevessel to the second valve fitting.

Pressurizing the pressure vessel can include, where the pressurizingvessel includes an input conduit to flow the cleaning fluid from acleaning fluid source into the pressure vessel and where thepressurizing vessel includes a pressure vessel pressure gaugefluidically coupled to the pressure vessel, sensing, by the pressurevessel pressure gauge, pressure vessel pressure. The method includesdetermining that the pressure vessel pressure, by the pressure vesselpressure gauge, is less than or equal to a minimum injection pressure.The minimum injection pressure is a minimum pressure necessary tounblock multiple valve fittings simultaneously. In response todetermining that the pressure vessel pressure is less than or equal to aminimum injection pressure, the method includes coupling a manual handpump to the input conduit. The method includes opening an input pressureisolation valve positioned in input conduit. The method includesoperating a manual hand pump coupled to the input conduit to raise thepressure vessel pressure to the minimum injection pressure. The methodincludes determining a pressure vessel pressure has reached at least theminimum injection pressure by the pressure vessel pressure gauge. Inresponse to determining that the pressure vessel pressure has reached atleast the minimum injection pressure, the method includes shutting theinput pressure isolation valve to maintain the pressure vessel pressureat the minimum injection pressure. The method includes decoupling themanual hand pump from the input conduit.

The method can include decoupling a first injection conduit second endfrom the first valve fitting. The method can include decoupling a secondinjection conduit second end from the second valve fitting.

The method can include determining the first valve fitting and thesecond valve fitting are blocked to fluid flow through the valve. Themethod includes opening the first injection valve. The method includeflowing the cleaning fluid through the first injection conduit. Themethod includes sensing the first injection conduit pressure is at leastthe minimum injection pressure. The method includes shutting the firstinjection valve. The method includes sensing a first injection conduitpressure rate decrease over a time period. The method includes comparingthe first injection conduit pressure rate decrease to a first injectionconduit pressure rate threshold decrease. The method includesdetermining that the first injection conduit is blocked when the firstinjection conduit pressure rate decrease is less than the firstinjection conduit pressure rate threshold decrease. The method includesopening the second injection valve. The method includes flowing thecleaning fluid through the second injection conduit. The method includessensing the second injection conduit pressure is at least the minimuminjection pressure. The method includes shutting the second injectionvalve. The method includes sensing a second injection conduit pressurerate decrease over the time period. The method includes comparing thesecond injection conduit pressure rate decrease to a second injectionconduit pressure rate threshold decrease. The method includesdetermining that the second injection conduit is blocked when the secondinjection conduit pressure rate decrease is equal to or less than thesecond injection conduit pressure rate threshold decrease.

The method can include determining the first valve fitting and thesecond valve fitting are unblocked to fluid flow through the valve. Themethod includes opening the first injection valve. The method includesflowing the cleaning fluid through the first injection conduit. Themethod includes sensing the first injection conduit pressure is at leastthe minimum injection pressure. The method includes shutting the firstinjection valve. The method includes sensing a first injection conduitpressure rate decrease over the time period. The method includescomparing the first injection conduit pressure rate decrease to a firstinjection conduit pressure rate threshold decrease. The method includesdetermining that the first injection conduit is unblocked when the firstinjection conduit pressure rate decrease is greater than the firstinjection conduit pressure rate threshold decrease. The method includesopening the second injection valve. The method includes flowing thecleaning fluid through the second injection conduit. The method includessensing the second injection conduit pressure is at least the minimuminjection pressure. The method includes shutting the second injectionvalve. The method includes sensing a second injection conduit pressurerate decrease over the time period. The method includes comparing thesecond injection conduit pressure rate decrease to a second injectionconduit pressure rate threshold decrease. The method includesdetermining that the second injection conduit is unblocked when thesecond injection conduit pressure rate decrease is equal to or greaterthan the second injection conduit pressure rate threshold decrease.

The details of one or more implementations of the subject matterdescribed in this disclosure are set forth in the accompanying drawingsand the description below. Other features, aspects, and advantages ofthe subject matter will become apparent from the description, thedrawings, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic of a tool coupled to multiple valve fittings.

FIG. 2 is a schematic view of another tool configured to clean multiplevalve fittings.

FIG. 3 is a schematic of the tool of FIG. 1 coupled to a manual handpump.

FIG. 4 is a flow chart of an example method of simultaneously cleaningmultiple valve fittings.

DETAILED DESCRIPTION OF THE DISCLOSURE

The present disclosure relates to a method of using a tool tosimultaneously unblock multiple valve fittings of a valve which areblocked to flow. Some examples of valves that can be blocked to flow areball valves and gate valves. Valves have components such as valve seatsor valve stems that can become blocked. Valve components can becomeblocked slowly due to corrosion of valve materials or due to buildup oforganic or inorganic matter. For example, a valve can fail due to theinability of a valve to change position when operated due to corrosionon a valve stem of the valve. Also, valve components can become blockedby a larger particle or foreign object becoming lodged betweencomponents. These types of blockages can cause the blocked valve to failto function as designed. Alternatively or in addition, a valve can failbecause debris can become lodged in a valve seat of the valve resultingin a valve disk or gate's inability to fully shut. Valves can beequipped with a valve fitting fluidically coupled to the components toallow flow of a fluid from an external source to the component for thepurpose of unblocking the component. For example, a valve stem fittingcan flow fluid from the external source to the blocked area by the valvestem.

The tool that simultaneously unblocks multiple valve fittings includes apressure vessel, an input conduit, a first injection conduit, and asecond injection conduit. The pressure vessel holds a cleaning fluid ata pressure. The input conduit is fluidically coupled to the pressurevessel. When a cleaning fluid source is coupled to the input conduit,the input conduit flows the cleaning fluid from the cleaning fluidsource to the pressure vessel. When a pressure source is connected tothe input conduit, the pressure source adjusts a pressure of thepressure vessel. The first injection conduit has a first injectionconduit first end mechanically coupled to the pressure vessel and afirst injection conduit second end mechanically coupled to the firstvalve fitting. The first injection conduit flows the cleaning fluid fromthe pressure vessel to the first valve fitting. The second injectionconduit has a second injection conduit first end mechanically coupled tothe pressure vessel and a second injection conduit second endmechanically coupled to the second valve fitting. The second injectionconduit flows the cleaning fluid from the pressure vessel to the secondvalve fitting. The blocked valve has a blocked first valve fitting and ablocked second valve fitting. The tool simultaneously flows the cleaningfluid from the pressure vessel through the first injection conduit tothe first valve fitting blocked to flow and through the second injectionconduit to the second valve fitting blocked to flow. The first valvefitting is unblocked in response to flowing the cleaning fluid to thefirst valve fitting. The second valve fitting is unblocked in responseto flowing the cleaning fluid to the second valve fitting.

Implementations of the present disclosure realize one or more of thefollowing advantages. The time required for valve maintenance can bereduced. For example, unblocking multiple blocked valve fittings on avalve simultaneously instead of sequentially can result in reducedequipment down time for maintenance. Valve operational time can beincreased. For example, performing frequent cleanings can prevent valvedamage that requires systems to be shut down and damaged or permanentlyblocked valves to be replaced. Additionally, valve life can beincreased. For example, valves can be completely unblocking morefrequently and cleaning of valve components can be achieved. Also,equipment safety can be improved. For example, proper operation of avalve required for a safety barrier for a high pressure, hightemperature, or hazardous fluid can be maintained.

Other advantages can include increased personnel safety. For example,the risk of equipment damage causing system failure can be reduced.Additionally, the tool and included components are sized so as to besmall and portable. For example, the tool can more easily accessdifficult to reach valves such as in subsea application, congestedareas, and high elevation areas.

As shown in FIG. 1 , a valve fitting unblocking tool 100 simultaneouslyunblocks a valve 102 with multiple valve fittings 104 blocked to flow.The first valve fitting blocked to flow is valve fitting 104 a. Thesecond valve fitting blocked to flow is valve fitting 104 b. The valvefitting 104 prevents fluids from leaking out of a valve when sealed, butallows fluid to flow into the valve when flushing the valve or out ofthe valve when bleeding the valve. For example, the valve fitting can bea screw-in connector or a nipple connector. As discussed earlier, thevalve fittings 104 are connected to different parts of the valve 102such as a valve body to block or bleed the valve, the valve seat, or thevalve stem. Some examples of valves with valve fittings are ball valvesand gate valves.

The valve fitting unblocking tool 100 includes a pressure vessel 126.The pressure vessel 126 receives the cleaning fluid 106, holds thecleaning fluid 106, and supplies the cleaning fluid 106 to the valvefittings 104 blocked to flow. The pressure vessel 126 can be pressurizedby an external pressure source, as shown in FIG. 3 . The pressure vessel126 can be pressurized to between 10,000 pounds per square inch (psi) to30,000 psi. A typical operating pressure for the valve fittingunblocking tool can be 15,000 psi. The pressure vessel 126 can be acontainer or housing constructed of a metal, for example steel, a steelalloy, or aluminum and that is fluidically sealed. The pressure vessel126 can be sized to have different capacities.

The pressure vessel 126 receives the cleaning fluid 106 from an externalcleaning fluid source 108. The external cleaning fluid source 108 can bepressurized or un-pressurized depending on the pressure of the pressurevessel 126. For example, in a pressurized state, the cleaning fluidsource 108 can inject the cleaning fluid 108 into the pressure vessel126. In this example, the external cleaning fluid source 108 can beanother pressure vessel such as a can of cleaning chemicals.Alternatively, in an un-pressurized state, the cleaning fluid source 108can pour the cleaning fluid 108 into the pressure vessel 126. Forexample, the external cleaning fluid source 108 can be a capped fluidcontainer.

The cleaning fluid 108 can be water, de-ionized water, or containadditional cleaning agents. Some examples of additional cleaning agentsinclude specialized valve cleaner liquids. Valve cleaner liquids canhave additional chemicals that react with the hardened material blockingthe valve fittings 104 to dissolve the blockage. The unblocking processcan require both high pressure and chemical reaction to clear theblockage. The valve fitting unblocking tool 100 can also be used topressurize a valve sealant and lubricant.

An input conduit 110 is mechanically coupled to the pressure vessel 126.The input conduit 110 flows a fluid from the external source 108 intothe pressure vessel 126. For example, the external source 108 cancontain the cleaning fluid 106 and the input conduit 110 can flow thecleaning fluid 106 from the external source 108 into the pressure vessel126. Alternatively or in addition, the external source 108 containpressurized gas such as air or nitrogen and the input conduit 110 andthe input conduit can flow the pressurized gas from the external source108 into the pressure vessel 126 to adjust a pressure of the pressurevessel 126. For example, the external source 108 can be a manual handpump 302, as shown in FIG. 3 , to increase the pressure of the cleaningfluid 106 in the pressure vessel 126. Referring to FIG. 3 , the manualhand pump 302 is a piston type pump with a piston 304 positioned withina pump body 306. The piston 304 moves within the pump body 306 tocompress the fluid within a volume 308 defined by the piston body 306and piston 304. The piston 304 is moved by a piston rod 310 connected toa handle 312. The handle 312 is moved by an operator. The input conduit110 can be a solid metal pipe, a braided metal hose, or a synthetichose. The input conduit 110 can include a fitting (not shown) to couplethe input conduit to the external source. For example, the fitting canbe a screw-in connector or a nipple connector.

Referring to FIG. 1 , the input conduit 110 can include an inputisolation valve 112 to control flow through the input conduit 110. Forexample, the input isolation valve 112 can be a ball valve that when inan open position allows flow of the fluid from the external source 108to the pressure vessel 126 and when in a shut position stops flow of thefluid from the external source 108 to the pressure vessel 126.

Multiple injection conduits are mechanically and fluidically coupled tothe pressure vessel 126. The injection conduits flow pressurizedcleaning fluid 106 from the pressure vessel 126 to multiple valvefittings simultaneously. The first injection conduit 114 a flows thepressurized cleaning fluid 106 from the pressure vessel 126 to the firstvalve fitting 104 a. The second injection conduit 114 b flows thepressurized cleaning fluid 106 from the pressure vessel 126 to thesecond valve fitting 104 b. As shown in FIG. 2 , the valve fittingunblocking tool 200 can include more than two injection conduits. Forexample, the valve fitting unblocking tool 200 has a third injectionconduit 114 c that flows the pressurized cleaning fluid 106 from thepressure vessel 126 to a third valve fitting (not shown). Additionally,valve fitting unblocking tool 200 has a fourth injection conduit 114 dthat flows the pressurized cleaning fluid 106 from the pressure vessel126 to a fourth valve fitting (not shown).

Referring to FIG. 2 , the injection conduits have a first end and asecond end. The first end is mechanically and fluidically coupled to thepressure vessel 126 and the second end is coupled to the valve fitting.The first injection conduit 114 a is mechanically and fluidicallycoupled to the pressure vessel 126 by the first end 216 a. The firstinjection conduit 114 a is mechanically and fluidically coupled to thefirst valve fitting 104 a by the second end 218 a. The second injectionconduit 114 a is mechanically and fluidically coupled to the pressurevessel 126 by the first end 216 a. The second injection conduit 114 a ismechanically and fluidically coupled to the second valve fitting 104 aby the second end 218 a. The third injection conduit 214 c ismechanically and fluidically coupled to the pressure vessel 126 by thefirst end 216 c. The third injection conduit 214 c is mechanically andfluidically coupled to the third valve fitting (not shown) by the secondend 118 c. The fourth injection conduit 114 d is mechanically andfluidically coupled to the pressure vessel 126 by the first end 216 d.The fourth injection conduit 114 d is mechanically and fluidicallycoupled to the fourth valve fitting 2 (not shown) by the first end 216d.

As shown in FIG. 1 , each injection conduit can include an isolationvalve positioned in the respective injection conduit to control the flowof fluid through the respective injection conduit. The isolation valvesare operated simultaneously to flow the cleaning fluid 106 from thepressure vessel 126 to the blocked valve fittings. A first isolationvalve 120 a controls the flow of fluid through the first injectionconduit 114 a. A second isolation valve 120 b controls the flow of fluidthrough the second injection conduit 114 b. Referring to FIG. 2 , athird isolation valve 220 b controls the flow of fluid through the thirdinjection conduit 214 c. A fourth isolation valve 220 d controls theflow of fluid through the fourth injection conduit 214 d. The isolationvalves (120 a, 120 b, 220 c, and 220 d) can be a ball valve that when inan open position allows flow of the fluid from the pressure vessel 126to the respective valve fitting 104 a, 104 b, and the third valvefitting and the fourth valve fitting (not shown) and when in a shutposition stops flow of the fluid from the pressure vessel 126 to therespective valve fitting 104 a, 104 b, and the third valve fitting andthe fourth valve fitting (not shown).

Each injection conduit can include a pressure gauge fluidically coupledto the injection conduit to sense the pressure of the cleaning fluid106. The pressure gauges are positioned in the downstream direction fromboth the pressure vessel 126 and the isolation valve, toward the valvefitting. The downstream direction is the direction of fluid flow fromthe pressure vessel 126 toward the valve 102. For example, a firstpressure gauge 122 a is fluidically coupled to injection conduit 114 ato sense the pressure of the cleaning fluid 106 in injection conduit 114a. Similarly, a second pressure gauge 122 b is fluidically coupled toinjection conduit 114 b to sense the pressure of the cleaning fluid 106in injection conduit 114 b. Referring to FIG. 2 , a third pressure gauge222 c is fluidically coupled to injection conduit 214 c to sense thepressure of the cleaning fluid 106 in injection conduit 214 c. Likewise,a fourth pressure gauge 222 d is fluidically coupled to injectionconduit 214 d to sense the pressure of the cleaning fluid 106 ininjection conduit 214 c.

A pressure vessel pressure gauge 124 can be fluidically coupled to thepressure vessel 126. The pressure vessel pressure gauge 124 senses thepressure in the pressure vessel 126. When the pressure vessel 126contains cleaning fluid 106, the pressure vessel pressure gauge 126senses the pressure of the cleaning fluid 106 in the pressure vessel126.

The valve fitting unblocking tool 100 can include a controller 224 asshown in FIG. 2 . In some implementations, the controller 224 is anon-transitory computer-readable medium storing instructions executableby one or more processors to perform operations described herein. Insome implementations, the controller includes firmware, software,hardware or combinations of them. The instructions, when executed by theone or more computer processors, cause the one or more computerprocessors to unblock multiple valve fittings with the valve fittingunblocking tool. The controller 224 is operatively coupled to thevarious valves described herein. The controller 224 also receivessignals representing conditions from the various sensors describedherein.

The controller 224 is operatively coupled to the input isolation valve112 to control flow through the input conduit 110. The controller 224commands the input isolation valve 112 to open, allowing flow or toclose, stopping flow through the input conduit 110. In the same way, thecontroller 224 is operative coupled to the first isolation valve 120 a,the second isolation valve 120 b, the third isolation valve 220 c, andthe fourth isolation valve 220 d. The controller 224 commands the firstisolation valve 120 a to open, allowing flow or to close, stopping flowthrough the first injection conduit 114 a. The controller 224 commandsthe second isolation valve 120 b to open, allowing flow or to close,stopping flow through the second injection conduit 114 b. The controller224 commands the third isolation valve 220 c to open, allowing flow orto close, stopping flow through the third injection conduit 214 c. Thecontroller 224 commands the fourth isolation valve 220 d to open,allowing flow or to close, stopping flow through the fourth injectionconduit 214 d.

The controller 224 receives a signal from the pressure vessel pressuregauge 124 representing the pressure vessel 126. The controller 224receives a signal from the first pressure gauge 122 a representing thepressure of the cleaning fluid 106 in injection conduit 114 a.Similarly, the controller 224 receives a signal from the second pressuregauge 122 b representing the pressure of the cleaning fluid 106 ininjection conduit 114 b. Referring to FIG. 2 , the controller 224receives a signal from the third pressure gauge 222 c representing thepressure of the cleaning fluid 106 in injection conduit 214 c. Likewise,the controller 224 receives a signal from the fourth pressure gauge 222d representing the pressure of the cleaning fluid 106 in injectionconduit 214 c.

The controller 224 can control the process of pressurizing the pressurevessel. The pressure vessel pressure gauge 124 senses the pressurevessel pressure. The pressure vessel pressure gauge 124 transmits asignal representing the pressure vessel pressure to the controller 224.The controller 224 then determines when the pressure vessel pressure isless than or equal to a minimum injection pressure. In response todetermining that the pressure vessel pressure is less than or equal to aminimum injection pressure, the controller 224 opens the input pressureisolation valve 112 allowing flow of the pressurized cleaning fluid intothe pressure vessel 126. Alternatively, the manual hand pump 108, shownin FIG. 3 , is operated to raise the pressure vessel pressure to theminimum injection pressure. The controller 224 determines that apressure vessel 126 pressure has reached at least the minimum injectionpressure by receiving signals from the pressure vessel pressure gauge124. In response to determining that the pressure vessel 126 pressurehas reached at least the minimum injection pressure, the controller 224shuts the input pressure isolation valve 112 to maintain the pressurevessel 126 pressure at the minimum injection pressure.

The controller 224 can simultaneously flow the cleaning fluid from thepressure vessel 126 through the first injection conduit 114 a to thefirst valve fitting 104 a and through the second injection conduit 114 bto the second valve fitting 104 b. The first pressure gauge 122 asamples the first fluid pressure in the first valve fitting 104 a andtransmits a signal representing the first fluid pressure to thecontroller 224. The second pressure gauge 122 b samples a second fluidpressure in the second valve fitting 104 b and transmits a signalrepresenting the second fluid pressure to the controller 224. Thecontroller 224 receives the first injection conduit 114 a pressure andthe second injection 114 b conduit pressure. The controller 224determines that the first injection conduit 114 a pressure is less thanthe minimum injection pressure. In response to determining that thefirst injection conduit 114 a pressure is less than the minimuminjection pressure, the controller 224 opens the first injection valve120 a positioned in the first injection conduit 114 a. The controller224 senses when the first injection conduit 114 a pressure is at leastthe minimum injection pressure. Responsive to sensing the firstinjection conduit 114 a pressure is at least the minimum injectionpressure, the controller 224 shuts the first injection valve 120 a.Simultaneously before the controller 224 opens the second injectionvalve 120 b, the controller 224 receives a second injection conduit 114b pressure sensed with the second pressure gauge 122 b. The controller224 determines that the second injection conduit 114 b pressure is lessthan the minimum injection pressure. In response to determining that thesecond injection conduit 114 b pressure is less than the minimuminjection pressure; the controller 224 opens the second injection valve120 b positioned in the second injection conduit 114 b. The controller224 compares the signal representing the second injection conduit 114 bpressure to the minimum injection pressure. The controller 224determines when the second injection conduit 114 b pressure is at leastthe minimum injection pressure. Responsive to determining that thesecond injection conduit 114 b pressure is at least the minimuminjection pressure, the controller 224 shuts the second injection valve114 b.

The controller 224 can determine when the first valve fitting 104 a andthe second valve fitting 104 b are blocked to fluid flow through thevalve 102. The controller 224 opens the first injection valve 120 a. Thecleaning fluid 106 is flowed through the first injection conduit 114 a.The controller 224 receives a signal representing the first injectionconduit 114 a pressure, which is compared to the minimum injectionpressure. The controller 224 determines when the first injection conduit114 a is at least the minimum injection pressure. The controller 224shuts the first injection valve. The controller 224 receives signalsrepresenting the first injection conduit 114 a over time. The controller224 determines the first injection conduit 114 a pressure rate decreaseover a time period. The controller 224 compares the first injectionconduit 114 a pressure rate decrease to a first injection conduit 114 apressure rate threshold decrease. The controller 224 determines that thefirst injection conduit 114 a is blocked when the first injectionconduit 114 a pressure rate decrease is less than the first injectionconduit 114 a pressure rate threshold decrease. The controller 224 opensthe second injection valve 120 b. The cleaning fluid 106 is flowedthrough the second injection conduit 114 b. The controller 224 receivesa signal representing the second injection conduit 114 b pressure andcompares the second injection conduit 114 b pressure to the minimuminjection pressure. When the controller 224 determines that the secondinjection conduit 114 b pressure is at least the minimum injectionpressure, the controller 224 shuts the second injection valve 120 b. Thecontroller 224 determines a second injection conduit 114 b pressure ratedecrease over the time period. The controller 224 compares the secondinjection conduit 114 b pressure rate decrease to a second injectionconduit 114 b pressure rate threshold decrease. The controller 224determines the second injection conduit 114 b to be blocked when thesecond injection conduit 114 b pressure rate decrease is equal to orless than the second injection conduit 114 b pressure rate thresholddecrease.

The controller 224 can determine when the first valve fitting 104 a andthe second valve fitting 104 b are unblocked to fluid flow through thevalve 102. The controller 224 opens the first injection valve 120 a. Thecleaning fluid 106 is flowed through the first injection conduit 114 a.The controller 224 receives a signal from the first pressure gauge 122 arepresenting the first injection conduit 114 a pressure. The controller224 determines that the first injection conduit 114 a pressure is atleast the minimum injection pressure. The controller 224 shuts the firstinjection valve 102 a. The controller 224 continues to receive signalsrepresenting the first injection conduit pressure. The controller 224determines a first injection conduit 114 a pressure rate decrease overthe time period. The controller 224 compares the first injection conduit114 a pressure rate decrease to a first injection conduit 114 a pressurerate threshold decrease. The controller 224 determines that the firstinjection conduit 114 a is unblocked when the first injection conduit114 a pressure rate decrease is greater than the first injection conduit114 a pressure rate threshold decrease. The controller 224 opens thesecond injection valve 120 b. The cleaning fluid 106 is flowed throughthe second injection conduit 114 b. The controller 224 receives a signalrepresenting the second injection conduit 114 b pressure and comparesthe second injection conduit 114 b pressure to the minimum injectionpressure. The controller 224 determines that the second injectionconduit 114 b pressure is at least the minimum injection pressure. Thecontroller 224 shuts the second injection valve. The controller 224continues to receive the signal representing the second injectionconduit 114 b pressure. The controller 224 determines a second injectionconduit 114 b pressure rate decrease over the time period. Thecontroller 224 compares the second injection conduit 114 b pressure ratedecrease to a second injection conduit 114 b pressure rate thresholddecrease. The controller 224 determines that the second injectionconduit 114 b is unblocked when the second injection conduit 114 bpressure rate decrease is equal to or greater than the second injectionconduit 114 b pressure rate threshold decrease.

FIG. 4 is a flow chart of an example method 400 of unblocking multiplevalve fittings with the valve fitting unblocking tool. At 402, a firstinjection conduit configured to flow a cleaning fluid is coupling to afirst valve fitting. The first valve fitting is blocked to fluid flowthrough the valve.

At 404, a second injection conduit configured to flow the cleaning fluidis couple to a second valve fitting. The second valve fitting is blockedto fluid flow through the valve. At 406, the first injection conduit iscoupled to a pressure vessel configured to hold the cleaning fluid. Thecleaning fluid can be flowed from a cleaning fluid source through aninput conduit into the pressure vessel. At 408, the second injectionconduit is coupled to the pressure vessel. At 410, the pressure vesselholding the cleaning fluid is pressurized.

At 412, responsive to pressurizing the pressure vessel, the cleaningfluid from the pressure vessel is simultaneously flowed through thefirst injection conduit to the first valve fitting and through thesecond injection conduit to the second valve fitting. The cleaning fluidfrom the pressure vessel can be simultaneously flowed through the firstinjection conduit to the first valve fitting by opening a firstinjection valve positioned in the first injection conduit. The firstinjection valve is configured to control cleaning fluid flow through thefirst injection conduit. Responsive to opening the first injectionvalve, the cleaning fluid is flowed from the pressure vessel to thefirst valve fitting. Then, the first injection valve is shut. Responsiveto shutting the first injection valve, flow of the cleaning fluid isstopped from the pressure vessel to the first valve fitting.Simultaneously with opening the first injection valve, a secondinjection valve positioned in the second injection conduit configured tocontrol cleaning fluid flow through the second injection conduit isopened. Responsive to opening the second injection valve, the cleaningfluid from the pressure vessel is flowed to the second valve fitting.Then, the second injection valve is shut. Responsive to shutting thesecond injection valve, flow of the cleaning fluid from the pressurevessel to the second valve fitting is stopped.

Pressurizing the pressure vessel, where the pressurizing vessel includesan input conduit configured to flow the cleaning fluid from a cleaningfluid source into the pressure vessel and a pressure vessel pressuregauge fluidically coupled to the pressure vessel, can include sensing,by the pressure vessel pressure gauge, pressure vessel pressure.Pressurizing the pressure vessel can then include determining that thepressure vessel pressure, by the pressure vessel pressure gauge, is lessthan or equal to a minimum injection pressure. The minimum injectionpressure is a minimum pressure necessary to unblock multiple valvefittings simultaneously. In response to determining that the pressurevessel pressure is less than or equal to a minimum injection pressure, amanual hand pump is coupled to the input conduit. An input pressureisolation valve positioned in input conduit is opened. A manual handpump coupled to the input conduit is operated to raise the pressurevessel pressure to the minimum injection pressure. It is determined thata pressure vessel pressure has reached at least the minimum injectionpressure by the pressure vessel pressure gauge. In response todetermining that the pressure vessel pressure has reached at least theminimum injection pressure, the input pressure isolation valve is shutto maintain the pressure vessel pressure at the minimum injectionpressure. The manual hand pump is decoupled from the input conduit.

Simultaneously flowing the cleaning fluid from the pressure vesselthrough the first injection conduit to the first valve fitting andthrough the second injection conduit to the second valve fitting caninclude where a first pressure gauge is fluidically coupled to the firstinjection conduit downstream from the first injection valve. Downstreamfrom the first injection valve is away from the pressure vessel. Thefirst pressure gauge is configured to monitor a first fluid pressure inthe first valve fitting. A second pressure gauge is fluidically coupledto the second injection conduit downstream from the second injectionvalve. The second pressure gauge is configured to monitor a second fluidpressure in the second valve fitting. A first injection conduit pressureis sensed with the first pressure gauge. It is determined that the firstinjection conduit pressure is less than the minimum injection pressure.In response to determining that the first injection conduit pressure isless than the minimum injection pressure; the first injection valvepositioned in the first injection conduit is opened. It is sensed thatthe first injection conduit pressure is at least the minimum injectionpressure. Responsive to sensing the first injection conduit pressure isat least the minimum injection pressure, the first injection valve isshut. Simultaneously before opening the second injection valve, a secondinjection conduit pressure is sensed with the second pressure gauge. Itis determined that the second injection conduit pressure is less thanthe minimum injection pressure. In response to determining that thesecond injection conduit pressure is less than the minimum injectionpressure; the second injection valve positioned in the second injectionconduit is opened. It is sensed that the second injection conduitpressure is at least the minimum injection pressure. Responsive tosensing the second injection conduit pressure is at least the minimuminjection pressure, the second injection valve is shut.

The method can further include determining that the first valve fittingand the second valve fitting are blocked to fluid flow through thevalve. The first injection valve is opened. The cleaning fluid is flowedthrough the first injection conduit. The first injection conduitpressure is sensed to be at least the minimum injection pressure. Thefirst injection valve is shut. A first injection conduit pressure ratedecrease over a time period is sensed. The first injection conduitpressure rate decrease is compared to a first injection conduit pressurerate threshold decrease. It is determined that the first injectionconduit is blocked when the first injection conduit pressure ratedecrease is less than the first injection conduit pressure ratethreshold decrease. The second injection valve is opened. The cleaningfluid is flowed through the second injection conduit. The secondinjection conduit pressure is sensed to be at least the minimuminjection pressure. The second injection valve is shut. A secondinjection conduit pressure rate decrease over the time period is sensed.The second injection conduit pressure rate decrease is compared to asecond injection conduit pressure rate threshold decrease. The secondinjection conduit is determined to be blocked when the second injectionconduit pressure rate decrease is equal to or less than the secondinjection conduit pressure rate threshold decrease.

The method can further include determining the first valve fitting andthe second valve fitting are unblocked to fluid flow through the valve.The first injection valve is opened. The cleaning fluid is flowedthrough the first injection conduit. The first injection conduitpressure is sensed to be at least the minimum injection pressure. Thefirst injection valve is shut. A first injection conduit pressure ratedecrease over the time period is sensed. The first injection conduitpressure rate decrease is compared to a first injection conduit pressurerate threshold decrease. The first injection conduit is determined to beunblocked when the first injection conduit pressure rate decrease isgreater than the first injection conduit pressure rate thresholddecrease. The second injection valve is opened. The cleaning fluid isflowed through the second injection conduit. The second injectionconduit pressure is sensed to be at least the minimum injectionpressure. The second injection valve is shut. A second injection conduitpressure rate decrease over the time period is sensed. The secondinjection conduit pressure rate decrease is compared to a secondinjection conduit pressure rate threshold decrease. The second injectionconduit is determined to be unblocked when the second injection conduitpressure rate decrease is equal to or greater than the second injectionconduit pressure rate threshold decrease.

At 414, responsive to flowing the cleaning fluid to the valve fitting,the first valve fitting is unblocked and responsive to flowing thecleaning fluid to the valve fitting, the second valve fitting isunblocked. A first injection conduit second end can be decoupled fromthe first valve fitting and a second injection conduit second end can bedecoupled from the second valve fitting.

Although the present implementations have been described in detail, itshould be understood that various changes, substitutions, andalterations can be made hereupon without departing from the principleand scope of the disclosure. Accordingly, the scope of the presentdisclosure should be determined by the following claims and theirappropriate legal equivalents.

The invention claimed is:
 1. A method comprising: coupling a toolconfigured to unblock multiple valve fittings simultaneously to a valvecomprising a first valve fitting and a second valve fitting, wherein thefirst valve fitting and the second valve fitting are blocked to fluidflow through the valve, the tool comprising: a pressure vesselconfigured to hold a cleaning fluid; an input conduit fluidicallycoupled to the pressure vessel, the input conduit configured to flow thecleaning fluid from a cleaning fluid source to the pressure vessel andto adjust a pressure of the pressure vessel; a first injection conduithaving a first injection conduit first end mechanically coupled to thepressure vessel at a first location, a first injection conduit secondend configured to mechanically couple to the first valve fitting, thefirst injection conduit configured to flow the cleaning fluid from thepressure vessel to the first valve fitting, the first injection conduitcomprising a first injection valve positioned in the first injectionconduit, the first injection valve configured to control cleaning fluidflow from the first location of the pressure vessel through the firstinjection conduit; and a second injection conduit having a secondinjection conduit first end mechanically coupled to the pressure vesselat a second location different than the first location, a secondinjection conduit second end configured to mechanically couple to thesecond valve fitting, the second injection conduit configured to flowthe cleaning fluid from the pressure vessel to the second valve fitting,the second injection conduit comprising a second injection valvepositioned in the second injection conduit, the second injection valveconfigured to control cleaning fluid flow from the second location ofthe pressure vessel through the second injection conduit, whereincoupling the tool to the valve comprises: coupling the first injectionconduit first end to the pressure vessel at the first location; couplingthe first injection conduit second end to the first valve fitting;fluidically coupling a first pressure gauge to the first injectionconduit downstream from the first injection valve, where downstream fromthe first injection valve is away from the pressure vessel, the firstpressure gauge configured to monitor a first injection conduit pressurein the first valve fitting; coupling the second injection conduit firstend to the pressure vessel at the second location; and coupling thesecond injection conduit second end to the second valve fitting;fluidically coupling a second pressure gauge to the second injectionconduit downstream from the second injection valve, where downstreamfrom the second injection valve is away from the pressure vessel, thesecond pressure gauge configured to monitor a second injection conduitpressure in the second valve fitting; simultaneously flowing thecleaning fluid from the first location of the pressure vessel throughthe first injection conduit to the first valve fitting and from thesecond location of the pressure vessel through the second injectionconduit to the second valve fitting, wherein flowing the cleaning fluidfrom the first location of the pressure vessel through the firstinjection conduit to the first valve fitting comprises a first processand flowing the cleaning fluid from the second location of the pressurevessel through the second injection conduit to the second valve fittingcomprises a second process simultaneous with the first process; whereinthe first process comprises: before opening the first injection valve,sensing the first injection conduit pressure with the first pressuregauge; determining that the first injection conduit pressure is lessthan a minimum injection pressure; in response to determining that thefirst injection conduit pressure is less than the minimum injectionpressure, opening the first injection valve positioned in the firstinjection conduit; flowing the cleaning fluid from the first location ofthe pressure vessel through the first injection conduit to the firstvalve fitting; sensing the first injection conduit pressure is at leastthe minimum injection pressure; responsive to sensing the firstinjection conduit pressure is at least the minimum injection pressure,shutting the first injection valve; opening the first injection valvepositioned in the first injection conduit; responsive to opening thefirst injection valve, flowing the cleaning fluid from the firstlocation of the pressure vessel to the first valve fitting; shutting thefirst injection valve; responsive to shutting the first injection valve,stopping flow of the cleaning fluid from the first location of thepressure vessel to the first valve fitting; wherein the second processcomprises: before opening the second injection valve, sensing the secondinjection conduit pressure with the second pressure gauge; determiningthat the second injection conduit pressure is less than the minimuminjection pressure; in response to determining that the second injectionconduit pressure is less than the minimum injection pressure, openingthe second injection valve positioned in the second injection conduit;sensing the second injection conduit pressure is at least the minimuminjection pressure: and responsive to sensing the second injectionconduit pressure is at least the minimum injection pressure, shuttingthe second injection valve; opening the second injection valvepositioned in the second injection conduit; responsive to opening thesecond injection valve, flowing the cleaning fluid from the secondlocation of the pressure vessel through the second injection conduit tothe second valve fitting; shutting the second injection valve; andresponsive to shutting the second injection valve, stopping flow of thecleaning fluid from the second location of the pressure vessel to thesecond valve fitting; responsive to performing the first process,unblocking the first valve fitting; and responsive to performing thesecond process, unblocking the second valve fitting.
 2. The method ofclaim 1, wherein flowing the cleaning fluid from the first location ofthe pressure vessel through the first injection conduit to the firstvalve fitting and from the second location of the pressure vesselthrough the second injection conduit to the second valve fitting furthercomprises pressurizing the pressure vessel.
 3. The method of claim 2,wherein the tool further comprises a manual hand pump, whereinpressurizing the pressure vessel further comprises: coupling the manualhand pump to the input conduit; opening an input pressure isolationvalve positioned in the input conduit; operating the manual hand pumpcoupled to the input conduit to raise the pressure of the pressurevessel to the minimum injection pressure, wherein the minimum injectionpressure is a minimum pressure necessary to unblock the multiple valvefittings simultaneously; determining the pressure of the pressure vesselhas reached at least the minimum injection pressure; and in response todetermining that the pressure of the pressure vessel has reached atleast the minimum injection pressure, shutting the input pressureisolation valve to maintain the pressure of the pressure vessel at theminimum injection pressure.
 4. The method of claim 1, wherein the toolfurther comprises a pressure vessel pressure gauge fluidically coupledto the pressure vessel, the method further comprising sensing, by thepressure vessel pressure gauge, the pressure of the pressure vessel. 5.The method of claim 1, further comprising, flowing the cleaning fluidfrom the cleaning fluid source through the input conduit into thepressure vessel.
 6. The method of claim 1, further comprising decouplingthe tool from the valve.
 7. The method of claim 6, wherein decouplingthe tool from the valve further comprises: decoupling the firstinjection conduit second end from the first valve fitting; anddecoupling the second injection conduit second end from the second valvefitting.
 8. The method of claim 1, wherein the tool is portable.
 9. Themethod of claim 1, further comprising determining the first valvefitting and the second valve fitting are blocked to fluid flow throughthe valve by: opening the first injection valve; flowing the cleaningfluid through the first injection conduit, sensing the first injectionconduit pressure is at least the minimum injection pressure; shuttingthe first injection valve; sensing a first injection conduit pressurerate decrease over a time period; comparing the first injection conduitpressure rate decrease to a first injection conduit pressure ratethreshold decrease; determining that the first injection conduit isblocked when the first injection conduit pressure rate decrease is lessthan the first injection conduit pressure rate threshold decrease;opening the second injection valve; flowing the cleaning fluid throughthe second injection conduit, sensing the second injection conduitpressure is at least the minimum injection pressure; shutting the secondinjection valve; sensing a second injection conduit pressure ratedecrease over the time period; comparing the second injection conduitpressure rate decrease to a second injection conduit pressure ratethreshold decrease; and determining that the second injection conduit isblocked when the second injection conduit pressure rate decrease isequal to or less than the second injection conduit pressure ratethreshold decrease.
 10. The method of claim 9, further comprisingdetermining the first valve fitting and the second valve fitting areunblocked to fluid flow through the valve by: opening the firstinjection valve; flowing the cleaning fluid through the first injectionconduit, sensing the first injection conduit pressure is at least theminimum injection pressure; shutting the first injection valve; sensingthe first injection conduit pressure rate decrease over the time period;comparing the first injection conduit pressure rate decrease to thefirst injection conduit pressure rate threshold decrease; determiningthat the first injection conduit is unblocked when the first injectionconduit pressure rate decrease is greater than the first injectionconduit pressure rate threshold decrease; opening the second injectionvalve; flowing the cleaning fluid through the second injection conduit,sensing the second injection conduit pressure is at least the minimuminjection pressure; shutting the second injection valve; sensing thesecond injection conduit pressure rate decrease over the time period;comparing the second injection conduit pressure rate decrease to thesecond injection conduit pressure rate threshold decrease; anddetermining that the second injection conduit is unblocked when thesecond injection conduit pressure rate decrease is equal to or greaterthan the second injection conduit pressure rate threshold decrease. 11.The method of claim 1, wherein coupling the first injection conduitsecond end to the first valve fitting and coupling the second injectionconduit second end to the second valve fitting comprises coupling eachof the first injection conduit and the second injection conduit to onevalve fitting of the multiple valve fittings.
 12. The method of claim 1,further comprising determining the minimum injection pressure, whereinthe minimum injection pressure is a minimum pressure necessary tounblock the first valve fitting and the second valve fittingsimultaneously.